A continuous pilot-scale system using coal-mine drainage sludge to treat acid mine drainage contaminated with high concentrations of Pb, Zn, and other heavy metals
- Authors
- Cui, Mingcan; Jang, Min; Cho, Sang-Hyun; Khim, Jeehyeong; Cannon, Fred S.
- Issue Date
- 15-5월-2012
- Publisher
- ELSEVIER
- Keywords
- Sludge; Acid mine drainage; Heavy metal; Stirring tank reactor
- Citation
- JOURNAL OF HAZARDOUS MATERIALS, v.215, pp.122 - 128
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF HAZARDOUS MATERIALS
- Volume
- 215
- Start Page
- 122
- End Page
- 128
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/108420
- DOI
- 10.1016/j.jhazmat.2012.02.042
- ISSN
- 0304-3894
- Abstract
- A series of pilot-scale tests were conducted with a continuous system composed of a stirring tank reactor, settling tank, and sand filter. In order to treat acidic drainage from a Pb-Zn mine containing high levels of heavy metals, the potential use of coal-mine drainage sludge (CMDS) was examined. The pilot-scale tests showed that CMDS could effectively neutralize the acidic drainage due to its high alkalinity production. A previous study revealed that calcite and goethite contained in CMDS contributed to dissolutive coprecipitation and complexation with heavy metals. The continuous system not only has high removal efficiencies (97.2-99.8%), but also large total rate constants (K-total, 0.21-10.18 h(-1)) for all heavy metals. More specifically, the pilot system has a much higher Zn(II) loading rate (45.3 g m(-3) day(-1)) than other reference systems, such as aerobic wetland coupled with algal mats and anoxic limestone drains. The optimum conditions were found to be a CMDS loading of 280 g L-1 and a flow rate of 8 L day(-1), and the necessary quantity of CMDS was 91.3 g L-1 day(-1), as the replacement cycle of CMDS was determined to be 70 days. (C) 2012 Elsevier B.V. All rights reserved.
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Collections - College of Engineering > School of Civil, Environmental and Architectural Engineering > 1. Journal Articles
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